You'll be about 13:1 with an eagle on a stock 5.7 block. The combo runs really good with the right tuning.

I'm going for 11:1 on a 6.1 with ported eagles. The chamber is very tolerant to compression in stock form and exponentially better when ported. Cam events are the biggest key to getting it right. Even though you gain compression with an eagle head, you also gain quench...which makes all of the downsides to more compression invalid.